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the question "how fast does an evader go?" is about to be answered.venom racing has developed
the Venom speed meter,an easy set up system that will let you know exactly what's going on in your rc
car or truck.I picked up a VSM and decided to try it out on my duratrax nitro evader st.here's how it
was done.....
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Here is a picture of the VSM display,along with the display you get a sensor,2 magnets,and some mounting
hardware.It not only records top speed (in MPH or KPH),it also keeps track of how much distance has been
traveled,and battery voltage level.
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A relatively sturdy monting bracket is required for the sensor,since it will have to cope with engine/chassis
vibration.I had a broken battery box from the truck sitting around,so I decided to cut an L-shaped bracket
from a corner of the old battery box.I then drilled two holes to mount the sensor,and one to attach the
bracket to one of the servo screws (outer screw).It's important to test fit the bracket and sensor before
you mount the magnet,the sensor has some adjustment but it's rather limited (plus you want to make sure
there won't be any interference with the spur gear screws and throttle linkage).In this case I found
that one of the outer small holes already drilled on the spur gear aligned nicely with the center of
the sensor pick-up,so I used it as a reference point as to where the magnet should be mounted.
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I decided to install the magnet on the face of the spur gear.I found an old plastic bushing that had
a center opening big enough for the magnet to fit in.I CA glued the magnet into the bushing,then the
bushing onto the gear.This ensures that the magnet is mounted further from the gear surface than the
retaining screws on the gear,and allows for a closer gap between the magnet and sensor (the instructions
call for 1-3mm clearence for best results).
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Now that the sensor and magnet are mounted an aligned,I proceeded to route the wiring back to the VSM
display then plugged the VSM display into my reciever.I chose to remove the power switch,fuel tank,and
servo brace/reciever box so that I could route all the wiring as cleanly as possible.I used two layers
of servo tape to secure the VSM display to the top of the reciever box.Now I just calibrate the unit
according to the instructions and I'm ready to see just how fast this truck can go.
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